Knob-spindle fastener.



W. GURLETTV. KNOB SPINDLE FASTENER.

APLIOATION FILED APB.. 21. 1909. BENBWBD MAR. 31, 1910.

@Mum/Iton Strom,

Patented May 3, 1910.

WILLIAM CURLETT, OF SAN FRANCISCO, CALIFORNIA.

KNOB-SPINDLE FASTENER.

Specification of Letters Patent.

Patented May 3, 1910.

Application filed April 21, 1909, Serial No. 491,336. Renewed March 31,1910. Serial No. 552,634.

T o all whom fit may concern.' y

Be it. known that I, VILLLUI C'UnLn'r'r, citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented new and useful Improvements in Knob-SpindleFasteners, of which the following is a speciiication.

My invention pertains to locks and latches, and particularly toknob-spindle fasteners; and it consists in the peculiar' and advairtageous construction, hereinafter described and claimed, whereby whenoccasion demands a knob-spindle may be fixed against rotation with aview of preventing movement of the bolt connected with and designed tobe operated by the knob-spindle.

In the drawings accompanying and forming part of this specification:Figure l is a view illustrating my improved fastenerI con struction insection and plan as properly arranged relative to a portion of a spindleand a knob thereon. Fig. 2 is an elevation showing the inner side of thecasing comprised in my improvements. Fig. 3 is a section taken in theplane indicated by the line 3 3 of Fig. l, looking in the directionindicated by the arrow. Fig. l is a detail vertical section, with theback plate removed, showing the guideway in thecasing for the boltcomprised in my improvements, and also illustrating the stops forlimiting outward movement of the bolt. Fig. 5 is a view similar to Fig.2, but illustrating a modified embodiment of my invention. Fig. t3 is adetail view taken at a right angle to Fig. 5.

Referring by letter to the said drawings, and more particularly to Figs.l to 4l, there of: A is a spindle of the usual angular form incross-section.

B is an ordinary knob on the spindle, and C is the casing comprised inmy improvements. The casing C is made up of an escuteheon a which isshaped to receive and permit free turning of the reduced portion of theknob B, and is provided with a radially-disposed aperture I) in itsmarginal flange c, and is also provided .in said mar gina] flange withone or more, preferably two, protuberanees al, and a plate e seated inthe flange c of the escutcheon at the back thereof, and having notchesin its periphery receiving the protuberances (l, whereby theprotubcrances may be used for riveting the plate to the escutcheon, andscrews rlhe screws pass through the escutcheon and plate c, and serve toconnect the same t0 the door. As best shown in F l and 2, the plate c ofthe casing C is formed in part by a spring strip g which is produced byproviding the plate with parallel cuts extending to its periphery, andis equipped with a rounded protuberance L. The escutcheon (i of thecasing C is provided interiorly with a guidcway z', Fig. il, arranged inalinement with the before-mentioned aperture L, and is also provided atthe inner end of the said guideway 'i' with stops '.lhe said guideway iand stops j are designed to cooperate with the slide-bolt I) of thenovel fastener; the said slide-bolt being arranged `in the guideway z'and aperture b of the escutcheon 11., and being provided at its outerend with a linger-piece u. At its inner end the slide-bolt l) is forked,as indicated by Z, to straddle the spindle A, and at an intermediatepoint of its length said slidebolt is provided with shoulders mf,designed to bring up against the before-mentioned stops with a view oflimiting outward movement of the slide-bolt.

In its side adjacent the casing plate c, the slide-bolt I) is providedwith two depressions n, separated by an intervening Space, as best shownin Fig. l. One of the said dcpressions 11, is designed to receive theprotuberances /t of the spring strip f/ when the slide-bolt is inengagement with the spindle A to prevent turning thereof, and the otherdepression a has for its office to receive the protuberance /t when theslide-bolt is in its outermost position, and the spindle A is free toturn. Thus it will be manifest that the spring strip f/ is adapted tohold the slidebolt l) against casual movement when said slide-bolt iscooperating with the spindle A, and also when the slide-bolt is idle,and yet when it is desired, the slide-bolt may be moved from oneposition to the other by ex erting a slight pull or push on thefingerpiece thereof.

lt will be gathered from theI foregoingthat through the medium of myimprovements the spindle A may be expeditiously and easily lockedagainst; rotation when ocea- I sion demands, and by such operation adoor may be locked from the inside thereof. It will also be gathered byparticular reference to Figs. 1 and 2, that the parts of myiniprovements may be readily assembled in proper position, relative tothe splndle A and the knob l, and that incidental to such assemblage ofparts the projections d on the escutcheon a will, by enteringcomplementary notches in the back plate e, serve to facilitate placingof the spring strip g opposite the guideway z', and Will also serve toretain the plate e in proper position, especially when the projections dare used to rivet the plate e to escutcheon a.

In the modied construction shown in Fig. 5 and Fig. 6, the casing Ccomprises an escutcheon a and a back plate c', Which is soldered orotherwise connected to the back of the escutcheon a, as indicated by ItWill be readily appreciated from theforegoing description that bothembodiments of my invention are simple and coinpact and do not compriseany delicate parts such as are likely to get out of order after a shortperiod of use.

Vhile I prefer the specific constructions herein shown and described, Ido not desire to be understood as confining myself to the same, this forthe reason that in the future practice of the invention it may be founddesirable to make changes in the construction and relative arrangementof the parts Within the scope of my invention as claimed.

Having described my invention, what I claim and desire to secure byLetters-Patent, is:

In a knob-spindle fastener, a casing comprising an escutcheon, and aback-plate connected with the escutcheon and formed in part by a springstrip integral With the plate at one end and divided therefrom by slitsextending to the edge of the plate and having a protuberance adjacentits free end, in combination With a slidable bolt guided in the casing,between the escutcheon and the back plate thereof, and having adepression adapted to cooperate With the said protuberance of the springstrip.

In testimony whereof I have hereunto set my hand in presence of tWosubscribing Witnesses.

WILLIAM CURLETT. Witnesses:

FLORENCE D. FnNsoM, EDITH W. BURNHAM.

